阅读说明：本技术 强化热压柱状金刚石复合体孕镶钻头及其制造方法 (Enhanced hot-pressing columnar diamond complex impregnated bit and manufacturing method thereof ) 是由 叶宏煜 谢涛 杨凯华 邹盛树 金钟铃 于 2021-07-30 设计创作，主要内容包括：本发明公开了一种强化热压柱状金刚石复合体孕镶钻头及其制造方法。它包括钻头钢体、设置在钻头钢体端部的多个支撑体、焊接钻头钢体和支撑体的保径焊接层及水口,所述水口位于相邻的支撑体之间,所述保径焊接层位于钻头钢体与支撑体之间,所述支撑体内设有多个金刚石复合体,所述金刚石复合体按二环或三环排列,分布于支撑体中,所述金刚石复合体占钻头的工作底唇面积的55～80％；所述金刚石复合体内复合金刚石采用SMD-(40)金刚石,所述支撑体内复合金刚石采用SMD-(30)金刚石。本发明钻头结构独特,在正常钻进规程条件下,在坚硬致密弱研磨性岩层中钻进,钻进比压大,金刚石出刃好,可以取得钻进效率高与钻头使用寿命长的特点。(The invention discloses a reinforced hot-pressing columnar diamond complex impregnated bit and a manufacturing method thereof. The diamond composite drill bit comprises a drill bit steel body, a plurality of supporting bodies arranged at the end part of the drill bit steel body, gauge protection welding layers for welding the drill bit steel body and the supporting bodies, and water gaps, wherein the water gaps are positioned between the adjacent supporting bodies, the gauge protection welding layers are positioned between the drill bit steel body and the supporting bodies, a plurality of diamond composites are arranged in the supporting bodies, the diamond composites are arranged in two rings or three rings and distributed in the supporting bodies, and the diamond composites account for 55-80% of the area of a working bottom lip of the drill bit; the composite diamond in the diamond composite body adopts SMD 40 Diamond, composite diamond mining in the supportBy SMD 30 Diamond. The drill bit has a unique structure, and can drill in a hard, compact and weak-abrasiveness rock stratum under the condition of a normal drilling regulation, the specific drilling pressure is large, the diamond edge is good, and the characteristics of high drilling efficiency and long service life of the drill bit can be achieved.)

1. The utility model provides a hot pressing strengthening column diamond complex impregnated bit, includes drill bit steel body (7), sets up gauge protection welded layer (5) and mouth of a river (4) at a plurality of supporter (1), the welding drill bit steel body (7) of drill bit steel body (7) tip and supporter (1), mouth of a river (4) are located between adjacent supporter (1), gauge protection welded layer (5) are located between drill bit steel body (7) and supporter (1), its characterized in that: a plurality of diamond complexes (2) are arranged in the support body (1), the diamond complexes (2) are arranged in two or three rings and distributed in the support body (1), and the diamond complexes (2) account for 55-80% of the area of a working bottom lip of the drill bit; the hardness of the matrix of the diamond complex (2) is HRc 38-48, and the matrix is wear-resistantThe property is ML (0.32-0.45) × 10^-5(ii) a The hardness of the carcass of the support body (1) is HRc 13-HRc 16, and the wear resistance is ML (0.62-0.76) multiplied by 10^-5(ii) a The composite diamond in the diamond composite body (2) adopts SMD₄₀Diamond, the composite diamond in the support body (1) adopts SMD₃₀Diamond;

the diamond complex (2) comprises the following components in percentage by mass: 40-45% of WC, 12-18% of YG12, 8-10% of Ni, 3-6% of Mn and 25-32% of 660-Cu;

the carcass of the support body (1) comprises the following components in percentage by mass: 45-54% of Fe, 10-15% of Ni, 4-6% of Mn and 30-35% of 660-Cu;

the SMD₄₀The percentage concentration of the diamond is 86-100%, the 30/40-mesh granularity accounts for 55-70%, and the 50/60-mesh granularity accounts for 30-45%; the SMD₃₀The percentage concentration of the diamond is 45-55%, and the granularity is 40/50 meshes.

2. The enhanced hot-pressing cylindrical diamond composite impregnated drill bit according to claim 1, wherein: the diamond complex (2) is in a square column shape or a cylindrical shape, the side length or the diameter of the diamond complex is 4.5-7.0 mm, and the length of the diamond complex is 10-14 mm.

3. The method for manufacturing the enhanced hot-pressing columnar diamond composite impregnated drill bit according to claim 1, is characterized in that: the method comprises the following steps:

step 1: prefabricating a diamond composite body (2) by adopting a reinforced hot pressing method, wherein the matrix material of the diamond composite body (2) is prepared according to the following proportion: 40-45% of WC, 12-18% of YG12, 8-10% of Ni, 3-6% of Mn and 25-32% of 660-Cu; the composite diamond in the diamond composite body (2) adopts SMD₄₀Diamond, the SMD₄₀The percentage concentration of the diamond is 86-100%, the 30/40-mesh granularity accounts for 55-70%, and the 50/60-mesh granularity accounts for 30-45%; the matrix material and the diamond are respectively weighed in proportion, ball-milled and uniformly mixed, then placed into a die at one time, subjected to enhanced hot-pressing sintering, cooled, demoulded and subjected toRemoving oxide skin on the surface to obtain a diamond complex (2);

step 2: the carcass material of the support body (1) is prepared according to the following proportion: 45-54% of Fe, 10-15% of Ni, 4-6% of Mn and 30-35% of 660-Cu; the composite diamond in the support body (1) adopts SMD₃₀Diamond, the SMD₃₀The percentage concentration of the diamond is 45-55%, and the granularity is 40/50 meshes; will contain SMD₃₀The metal powder of the diamond is put into a graphite die, the diamond complex (2) is arranged in a two-ring or three-ring shape and is distributed and positioned in the metal powder of the support body (1), and the metal powder of the support body (1) fuses the diamond complex (2) and the drill steel body (7) into an integral drill.

4. The method of manufacturing an enhanced hot-pressing cylindrical diamond composite impregnated drill bit according to claim 3, wherein: in the step (1), the parameters of the intensified hot pressing process are as follows: the pressure is 18-22 MPa, the temperature is 980-995 ℃, the heat preservation and pressure maintaining are carried out for 7.5-9.0 min, and the tapping temperature is 750-780 ℃.

5. The method of manufacturing an enhanced hot-pressing cylindrical diamond composite impregnated drill bit according to claim 3, wherein: in the step (1), the prefabricated diamond complex (2) is in a square column shape or a cylindrical shape, the side length or the diameter is 4.5-7.0 mm, and the length is 10-14 mm; the diamond composite (2) has a hardness of HRc 38-48 and a wear resistance of ML (0.32-0.45) x 10^-5。

6. The method of manufacturing an enhanced hot-pressing cylindrical diamond composite impregnated drill bit according to claim 3, wherein: in the step (2), the hot pressing process parameters are as follows: the temperature is 935 to 950 ℃, the pressure is 15 to 16MPa, the temperature and the pressure are kept for 4.5 to 5.5min, and the tapping temperature is 780-800 ℃.

Technical Field

The invention belongs to the technical field of geological exploration, petroleum drilling or engineering investigation, and particularly relates to a reinforced hot-pressing columnar diamond complex impregnated bit and a manufacturing method thereof. And is also used for preventing and controlling geological disasters, in particular to a diamond drill bit for drilling hard and compact rocks.

Background

The prior art still mainly adopts a hot pressing method and an electroplating method to manufacture the diamond drill bit. The common diamond bit manufactured by the hot pressing method has higher hardness and wear resistance, and can meet the drilling requirements of most rock strata. However, the drilling time for drilling hard, compact and weak abrasive rock strata is very low, and is generally 0.3-0.4 m/h; the service life of the drill bit is short and is only about 5-8 m. The drill bit manufactured by the electroplating method has better adaptability and higher drilling speed, but also has low aging and short service life when drilling into hard to hard and compact rock formations.

As geological prospecting develops towards the deep part of a stratum, the rock stratum is harder and harder, the probability of the occurrence of a hard, compact and weak abrasive rock stratum is higher and higher, almost all metal ores can meet the rock stratum during drilling, the geological exploration process is seriously influenced, the drilling cost is increased, and the method becomes a difficult problem which troubles the prospecting engineering technicians for a long time.

In order to solve the problem of difficult drilling of the rock stratum, the prior art adopts a soft matrix with low wear resistance, the inner part of a working layer is of a homogeneous structure, and the diamond in the drill bit is expected to have high edge emergence and good edge emergence, so that the aim of improving the drilling speed is fulfilled. However, the fact shows that the soft and low-wear-resistance carcass cannot adapt to the rock stratum drilling, the main reasons for this carcass are that the carcass cannot adapt to the high-weight-on-bit condition, the soft carcass has plastic creep deformation which cannot effectively make the diamond go out of the edge, and the diamond cannot effectively cut into the rock, thus failing to achieve the intended purpose.

Disclosure of Invention

The invention aims to solve the defects of the background technology and provides a reinforced hot-pressing columnar diamond composite impregnated drill bit and a manufacturing method thereof.

The technical scheme adopted by the invention is as follows: a reinforced hot-pressing columnar diamond composite impregnated bit and a manufacturing method thereof comprise a bit steel body, a plurality of supporting bodies arranged at the end part of the bit steel body, gauge protection welding layers for welding the bit steel body and the supporting bodies and water gaps, wherein the water gaps are positioned between the adjacent supporting bodies, the gauge protection welding layers are positioned between the bit steel body and the supporting bodies, a plurality of diamond composites are arranged in the supporting bodies, the diamond composites are arranged in two or three rings and distributed in the supporting bodies, and the diamond composites account for 55-80% of the working bottom lip area of the bit; the hardness of the matrix of the diamond composite is HRc 38-48, and the wear resistance is ML (0.32-0.45) multiplied by 10^-5(ii) a The hardness of the tire body of the support body is HRc 13-HRc 16, and the wear resistance is ML (0.62-0.76) multiplied by 10^-5The bending strength reaches 750MPa degrees; the composite diamond in the diamond composite body adopts SMD₄₀Diamond, the composite diamond in the support adopts SMD₃₀Diamond;

the diamond composite body comprises the following components in percentage by mass: 40-45% of WC, 12-18% of YG12, 8-10% of Ni, 3-6% of Mn and 25-32% of 660-Cu;

the carcass of the support body comprises the following components in percentage by mass: 45-54% of Fe, 10-15% of Ni, 4-6% of Mn and 30-35% of 660-Cu;

the SMD₄₀The percentage concentration of the diamond is 86-100%, the 30/40-mesh granularity accounts for 55-70%, and the 50/60-mesh granularity accounts for 30-45%; the SMD₃₀The percentage concentration of the diamond is 45-55%, and the granularity is 40/50 meshes.

The purpose of the composite diamond in the support body is to improve the uniform abrasion degree of the drill bit and improve the drilling effect of the drill bit.

The diamond complex is in a square column shape or a cylindrical shape, the side length or the diameter of the diamond complex is 4.5-7.0 mm, and the length of the diamond complex is 10-14 mm.

A manufacturing method of an enhanced hot-pressing columnar diamond complex impregnated bit comprises the following steps:

step 1: prefabricating a diamond composite body by adopting a reinforced hot pressing method, wherein the matrix material of the diamond composite body comprises the following components in percentage by weight: 40-45% of WC, 12-18% of YG12, 8-10% of Ni, 3-6% of Mn and 25-32% of 660-Cu; the composite diamond in the diamond composite body adopts SMD₄₀Diamond, the SMD₄₀The percentage concentration of the diamond is 86-100%, the 30/40-mesh granularity accounts for 55-70%, and the 50/60-mesh granularity accounts for 30-45%; the matrix material and the diamond are respectively weighed in proportion, ball-milled and uniformly mixed, then are placed into a die at one time, are subjected to enhanced hot-pressing sintering, and are cooled, demoulded and subjected to surface descaling to obtain a diamond complex;

step 2: the carcass material of the support body is prepared according to the following proportion: 45-54% of Fe, 10-15% of Ni, 4-6% of Mn and 30-35% of 660-Cu; the composite diamond in the support body adopts SMD₃₀Diamond, the SMD₃₀The percentage concentration of the diamond is 45-55%, and the granularity is 40/50 meshes; will contain SMD₃₀The metal powder of the diamond is put into a graphite die, the diamond complex is arranged in a two-ring or three-ring shape and is distributed and positioned in the metal powder of the support body, and the metal powder of the support body fuses the diamond complex and the drill steel body into an integral drill through hot-pressing sintering.

In the step (1), the parameters of the intensified hot pressing process are as follows: the pressure is 18-22 MPa, the temperature is 980-995 ℃, the heat preservation and pressure maintaining are carried out for 7.5-9.0 min, and the tapping temperature is 750-780 ℃.

In the step (1), the prefabricated diamond composite is in a square column shape or a cylindrical shape, the side length or the diameter is 4.5-7.0 mm, and the length is 10-14 mm; the diamond composite has a hardness of HRc 38-48 and an abrasion resistance of ML (0.32-0.45) x 10^-5。

In the step (2), the hot pressing process parameters are as follows: the temperature is 935-950 ℃, the pressure is 15-16 MPa, and when the temperature rises to 860 ℃, the intermediate temperature is preserved and the pressure is maintained for 30S; setting the temperature and pressure to the required value, keeping the temperature and pressure for 4.5-5.5 min, cooling to 780-800 ℃ along with the furnace, and discharging.

The diamond drill bit is formed by combining a diamond complex for breaking rock and a support body; the diamond composite part has high hardness and strong wear resistance; the hardness of the support body part is low, the diamond complex can be effectively consolidated and supported to work, and the diamond complex is firmly combined with the drill bit steel body; the diamond complexes are arranged in two or three rings and regularly distributed in the support body, and the diamond complexes account for 55-80% of the working bottom lip area of the drill bit. The drill bit has a unique structure, and can drill in a hard, compact and weak-abrasiveness rock stratum under the condition of a normal drilling regulation, the drilling specific pressure is large, the diamond edge is good, and the characteristics of high drilling efficiency and long service life of the drill bit can be achieved.

The invention adopts a reverse thinking method, and for a drill bit which drills into a hard compact weak abrasive rock stratum, a main body part of the drill bit, namely a diamond composite part, is prepared by adopting a hard and high-abrasive-resistance matrix instead of a soft and low-abrasive-resistance matrix, and is used for crushing a main body of rock. The diamond composite body occupies 55-80% of the area of the bottom lip in the working layer of the drill bit, and is 20-45% less in stress area than the working layer of a common diamond drill bit, so that the unit area drilling pressure of the drill bit is improved under the same drilling pressure, the multi-cutter multi-blade effect and the broken hole effect can be realized, rock powder can be discharged, the drill bit can be cooled, and the drilling problem of hard rock can be effectively overcome.

The support body is used for embedding and supporting the diamond complex, so that the integral bonding strength of the drill bit is improved; the matrix of the support body is compounded with diamond, the hardness of the matrix is lower, the wear resistance is also lower, the diamond edge is better, and the diamond-. The purpose of the support body is designed, and the problems that the diamond complex is small in specification, small in bending strength, not enough in bonding strength with a drill steel body and the like are solved.

The support body is compounded with diamond, and aims to improve the wear balance degree of the drill bit, improve the drilling effect of the drill bit and prolong the service life of the drill bit.

The invention has the beneficial effects that:

(1) the drill bit has novel and unique structure, the diamond complex of the drill bit has high hardness, strong wear resistance, good quality and high concentration of diamond, and small contact area with rock, and the structure and the characteristics are very favorable for breaking the rock and obtaining good drilling effect.

(2) The drill bit support body has low hardness and low wear resistance, and the bit pressure consumption during drilling is small, so that the drilling pressure of the main working body is effectively improved, and the drilling efficiency of the drill bit is improved; the support body is used for consolidating the diamond complex and firmly welding with the drill steel body. The structural characteristics of the drill bit and the resulting drilling advantages ensure that the drill bit achieves the advantages of drilling hard to hard, compact rock.

(3) The matrix material adopted by the diamond composite body of the drill bit has low copper alloy element content and high framework material content, the loss of copper alloy can not occur under the action of reinforced hot pressing by matching with metals such as iron, nickel, manganese and the like, the mechanical property of the matrix of the drill bit is stable, the firmness of embedding diamond is improved, and the diamond can be timely and effectively edged, so that the basis for realizing the efficient and long-life drilling of the drill bit is realized.

(4) The drill bit matrix manufactured by the common hot pressing method mainly depends on the bonding effect of the copper alloy to realize the integral strength of the matrix, the bonding force of the copper alloy is limited, the hot pressing temperature and pressure are limited, and the drill bit lacks the advantages of performance and effect; the structure of the drill bit and the advantages of the mechanical properties of the matrix are obvious, the contact state of the matrix of the drill bit and the rock is different, the friction coefficient between the drill bit and the rock is improved, the friction and wear state of the matrix of the common drill bit and the rock is changed, the mechanism of breaking the rock by the diamond drill bit and the mode of breaking the rock by the diamond are changed, the effective and timely exposure of the diamond is facilitated, and the drilling effect of the drill bit is improved.

(5) The diamond complex with high densification is manufactured, so that the effective combination of the matrix metal and the surface of the diamond can be improved, the strong embedding of the diamond is realized, and the matrix material can also keep the self-sharpening effect of the diamond; the support body of the drill bit contains diamond, the diamond is optimally matched with the diamond complex, the stable drilling and the balanced abrasion of the drill bit are solved, the benign complementation is realized, the drilling speed is effectively improved, and the advantages are the conditions and the advantages which are not possessed by the common diamond drill bit.

(6) And the specification of the diamond composite body is as follows: the side length (or diameter) is 4.5-7.0 mm, and the length is 10-14 mm; the side length (or diameter) can be flexibly selected and matched in a fan-shaped working body according to the type and specification of the drill bit, the size can be combined, and the arrangement from one ring to three rings can be realized to generate different effects; a working layer 14mm high may improve the life of the drill bit.

(7) The test result shows that when the diamond composite drill bit disclosed by the invention is used for drilling hard to hard compact rock, compared with a common drill bit, the drilling speed can be improved by about 2.4 times, the service life is improved by about 2 times, and the diamond composite drill bit is used for drilling in hard rock with the drillability of 9-10 grades, wherein the drilling hour efficiency of the drill bit disclosed by the invention reaches 1.16m/h, and the service life of the drill bit averagely reaches 41.8 m/per drill bit; the drilling cost of the drill bit is reduced by about 3.2 yuan per meter, thus fundamentally solving the problem of difficult drilling of the rock stratum for a long time.

(8) Compared with the common drill bit, the drill bit of the invention has the following advantages that the laboratory and field drilling tests show that: the drilling efficiency can be improved by 32-35%, the service life is prolonged by 18-20%, and the drill bit can adapt to the drilling of five types of rocks with the drillability of 6-10 grades; the effect is more obvious particularly for drilling hard to hard and compact rock which is difficult to drill.

(9) In conclusion, the drill bit of the invention designs a scientific and practical structure and adopts an advanced forming process technology of reinforced hot pressing; the manufacturing precision of the drill bit is high, the performance is stable, and the overall effect of the drill bit is excellent.

Drawings

FIG. 1 is a view of the bottom lip face of the drill bit of the present invention;

FIG. 2 is a cross-sectional view taken along the direction D-D of FIG. 1, i.e., a longitudinal cross-sectional view of the drill bit;

FIG. 3 is a diagram of a two-ring structure of a diamond cylinder drill bit support according to the present invention;

FIG. 4(1) is a diagram of two rings of diamond cambered trapezoidal pillar drill supports according to the present invention;

FIG. 4(2) is a diagram of a diamond-curved trapezoidal pillar composite according to the present invention;

FIG. 5 is a three-ring structure diagram of the diamond cylinder drill bit support of the present invention.

In the figure, 1-support body, 2-diamond compound body, 3-diamond, 4-nozzle, 5-gauge welding layer, 6-gauge polycrystalline body of drill bit and 7-steel body of drill bit.

Detailed Description

The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.

As shown in fig. 1-5, a reinforced hot-pressing columnar diamond composite impregnated drill bit comprises a drill bit steel body 7, a plurality of support bodies 1 arranged at the end part of the drill bit steel body 7, a gauge protection welding layer 5 for welding the drill bit steel body 7 and the support bodies 1, and a water gap 4, wherein the water gap 4 is positioned between the adjacent support bodies 1, the gauge protection welding layer 5 is positioned between the drill bit steel body 7 and the support bodies 1, a plurality of diamond composites 2 are arranged in the support bodies 1, the diamond composites 2 are arranged in two or three rings and distributed in the support bodies 1, and the diamond composites 2 occupy 55-80% of the working bottom lip area of the drill bit; the hardness of the matrix of the diamond complex 2 is HRc 38-48, and the wear resistance is ML 0.32-0.45 multiplied by 10^-5(ii) a The hardness of the tire body of the support body 1 is HRc 13-HRc 16, and the wear resistance is ML 0.62-0.76 multiplied by 10^-5(ii) a The composite diamond in the diamond composite body 2 adopts SMD₄₀Diamond, the composite diamond in the support body 1 adopts SMD₃₀Diamond;

the matrix of the diamond complex 2 comprises the following components in percentage by mass: 40-45% of WC, 12-18% of YG12, 8-10% of Ni, 3-6% of Mn and 25-32% of 660-Cu;

the carcass of the support body 1 comprises the following components in percentage by mass: 45-54% of Fe, 10-15% of Ni, 4-6% of Mn and 30-35% of 660-Cu;

the SMD₄₀The percentage concentration of the diamond is 86-100%, the 30/40-mesh granularity accounts for 55-70%, and the 50/60-mesh granularity accounts for 30-45%; the SMD₃₀The percentage concentration of the diamond is 45-55%,the granularity is 40/50 meshes.

The diamond complex 2 is in a square column shape or a cylindrical shape, the side length or the diameter of the diamond complex is 4.5-7.0 mm, and the length of the diamond complex is 10-14 mm.

A manufacturing method of an enhanced hot-pressing columnar diamond complex impregnated bit comprises the following steps:

step 1: prefabricating a diamond composite body 2 by adopting a reinforced hot pressing method, wherein the matrix material of the diamond composite body 2 comprises the following components in percentage by weight: 40-45% of WC, 12-18% of YG12, 8-10% of Ni, 3-6% of Mn and 25-32% of 660-Cu; the composite diamond in the diamond composite body 2 adopts SMD₄₀Diamond, the SMD₄₀The percentage concentration of the diamond is 86-100%, the 30/40-mesh granularity accounts for 55-70%, and the 50/60-mesh granularity accounts for 30-45%; the matrix material and the diamond are respectively weighed in proportion, ball-milled and uniformly mixed, then are placed into a die at one time, are subjected to enhanced hot-pressing sintering, and are cooled, demoulded and subjected to surface descaling to obtain a diamond complex 2;

step 2: the carcass material of the support 1 is in the following proportions: 45-54% of Fe, 10-15% of Ni, 4-6% of Mn and 30-35% of 660-Cu; the composite diamond in the support body 1 adopts SMD₃₀Diamond, the SMD₃₀The percentage concentration of the diamond is 45-55%, and the granularity is 40/50 meshes; will contain SMD₃₀The metal powder of the diamond is put into a graphite mould, the diamond complex 2 is arranged in a two-ring or three-ring shape and is distributed and positioned in the metal powder of the support body 1, and the metal powder of the support body 1 fuses the diamond complex 2 and the drill steel body 7 into an integral drill through hot-pressing sintering.

In the step 1, the parameters of the intensified hot pressing process are as follows: the pressure is 18-22 MPa, the temperature is 980-995 ℃, the heat preservation and pressure maintaining are carried out for 7.5-9.0 min, and the tapping temperature is 750-780 ℃.

In the step 1, the prefabricated diamond complex 2 is in a square column shape or a cylindrical shape, the side length or the diameter is 4.5-7.0 mm, and the length is 10-14 mm; the diamond composite 2 has a hardness of HRc 38-48 and an abrasion resistance of ML 0.32-0.45X 10^-5。

In the step 2, the hot pressing process parameters are as follows: the temperature is 935 to 950 ℃, the pressure is 15 to 16MPa, the temperature and the pressure are kept for 4.5 to 5.5min, and the tapping temperature is 780-800 ℃.

The drill bit consists of a diamond complex and a support body, wherein the diamond complex is in a square column shape or a cylindrical shape and is prefabricated by adopting a reinforced hot pressing process; the diamond complexes are arranged in two or three rings and are regularly distributed in the support body, and the diamond complexes account for 55 to 80 percent of the area of the working bottom lip of the drill bit; the diamond complex has high hardness and wear resistance, and the diamond grade and the diamond concentration are high, so that the diamond complex plays a role in crushing rocks by a main body; the support body has lower hardness and lower wear resistance, plays a role in embedding, fixing a diamond complex and assisting in crushing rock, and is compounded with diamond; hot-pressing and sintering the mixture into a diamond drill bit through a medium-frequency electric furnace or a resistance furnace; the prepared drill bit has the characteristics of high drilling efficiency and long service life when drilling hard to hard and compact rock strata.

A diamond compact and a support. The diamond complex is prefabricated by adopting a strengthening hot pressing method, different working performances can be obtained by adjusting the material combination and diamond parameters of the diamond complex, and the requirement of drilling hard to hard-compact rocks is met; the diamond complexes are regularly arranged and distributed in the drill bit support body, the support body is made of iron, nickel, manganese and copper alloy, and the support body has low hardness and weak wear resistance; the main function is to firmly wrap the diamond complex under the hot-pressing condition and realize strong combination with the drill steel body, and finally the diamond drill bit which can meet the drilling requirement is manufactured.

(1) Diamond composite

The invention starts from the mechanical property of hard, compact and weak abrasive rock, researches the rock crushing mechanism, realizes that the large and reasonable bit pressure is needed to be adopted for drilling the rock, and leads the diamond to effectively go out of the edge and cut into the rock; due to the structural characteristics of the drill string, the working layer area and the scientific structural form of the drill bit can only be optimally designed, so that the bit pressure value of the drill bit in unit area can reach that the diamond can effectively cut into the rock, and the efficient drilling of the drill bit can be ensured. After calculation and optimization, the area of the diamond complex of the drill bit is the best 55-80% of the area of the working layer of the drill bit, and the requirement that the drill bit can obtain a good drilling effect in the rock with the drillability of 8-12 grades can be met.

Through analysis and test, the hardness of the diamond composite body is reasonable in the range of HRC 38-HRC 48, and the wear resistance of the diamond composite body is ML (0.32-0.45) multiplied by 10^-5The range can ensure good edge cutting and cutting effects of the diamond. The performance of the diamond composite body is adjusted mainly by adjusting the components and the content ratio of the diamond composite body and diamond parameters (granularity and concentration); meanwhile, the hot pressing process parameters can be adjusted in a matched manner.

Because the drill bits used for geological exploration have a plurality of specifications, different requirements are certainly required for the specifications of the diamond complexes, in order to meet the requirements of the drill bits with different specifications, the diamond complexes with a plurality of specifications are designed and combined for use by the complexes with different specifications, and the diamond complex is more flexible and convenient; meanwhile, the joint strength of the composite body in the support body can be improved, the effect of multiple cutters and multiple blades is realized, and the capability of crushing rocks is improved. The specifications of the diamond composite body are designed as follows according to the type and the specification of the drill bit: square column, side length: 4.5, 5.0, 5.5, 6.0, 6.5 and 7.0, the heights of which are all 10-14 mm; cylinder, diameter: phi 4.5, phi 5.0, phi 5.5, phi 6.0, phi 6.5, phi 7.0; the height of the steel plate is 10-14 mm.

The diamond composite body is prefabricated by adopting a reinforced hot pressing method. The mold is processed by using high-strength and high-density graphite as a mold material. According to the design, the matrix material and the diamond are respectively weighed and then put into a ball milling cylinder for ball milling and mixing, after being uniformly mixed, the weight of each composite is respectively weighed and then put into a graphite mold at one time, then the composite is placed into an automatic sintering furnace for hot-pressing sintering, and the diamond composite is obtained after cooling, demolding and removing the surface oxide skin.

The diamond complex adopts the parameters of the intensified hot pressing technology: the pressure is 18-22 MPa, the temperature is 980-995 ℃, the heat preservation and pressure maintaining are carried out for 7.5-9.0 min, and the tapping temperature is 750-780 ℃; when the temperature is increased to 860 ℃, the temperature and pressure are kept for 30S.

(2) And a support body

The support body is an important structural part for embedding the diamond composite body and connecting the drill steel body in the drill bit invented by the application, and the support body can show the function and value of the drill bit during the hot-press forming of the drill bit. The basic components of the material are as follows: 45-52% of iron, 10-15% of nickel, 3-5% of manganese, 30-35% of copper alloy, lower hardness HRC 13-HRC 16 of support body, lower ML (0.63-0.75) x 10 of wear resistance^-5. The hardness and the wear resistance of the support body can be properly adjusted by adjusting the content ratio of the basic components so as to adapt to the requirement of rock change.

In the support material, diamond must be compounded: granularity 40/50 mesh, grade SMD₃₀The percentage concentration is 45-55%; the diamond and the matrix material are uniformly mixed by a ball mill for standby.

(3) Drill bit assembly and hot press forming

The mold of the hot-pressing drill bit is manufactured by machining high-strength and high-density graphite materials. The diamond complex is fixed in the mould according to the designed scheme selectively and regularly, diameter-protecting material is added and fixed firmly by binder, then metal powder of support body is added, so that the mould assembly of sintered drill bit is completed.

And (4) feeding the assembled die into an intelligent intermediate-frequency hot-pressing electric furnace, feeding water, and starting the intermediate-frequency electric furnace for hot-pressing sintering. Hot pressing technological parameters: the temperature is 935-950 ℃, the pressure is 15-16 MPa, the temperature and the pressure are kept for 4.5-5.5 min, the tapping temperature is 780-800 ℃, and the temperature is cooled to the room temperature after tapping, thus completing the manufacture of the hot-pressed sintered diamond composite drill bit.

Example 1:

the specification of the drill bit with the diameter of 77/49mm is taken as an example for further explanation.

(1) The drill bit is designed into 8 fan-shaped working bodies, namely the drill bit is provided with 8 corresponding water gaps;

(2) the diameter of the cylindrical diamond complex is 6.5mm, and the height of the cylindrical diamond complex is 12 mm;

(3) and a matrix material of the cylindrical diamond complex: 15% of YG12, 45% of WC, 8% of Ni, 4% of Mn and 28% of 660-Cu;

(4) column, cylinderDiamond parameters in diamond-like composites: 68% in 35/40 meshes, 32% in 50/60 meshes and SMD in all₄₀A grade diamond;

(5) and the technological parameters of the reinforced hot-pressing cylindrical diamond complex are as follows: the pressure is 20MPa, the temperature is 990 ℃, the temperature and the pressure are kept for 7.5min, and the tapping temperature is 780 ℃;

(6) and a support body matrix material: 46% of Fe, 15% of Ni, 5% of Mn and 34% of 660-Cu;

(7) and compounding diamond in the matrix material of the support body: granularity 40/50 mesh, grade SMD₃₀The percentage concentration is 50 percent, and the diamond and the matrix material are uniformly mixed by a ball mill for standby;

(8) assembling a drill bit sintering mold, namely fixing the columnar diamond complex in the mold according to a designed scheme selectively and regularly, adding a gauge protection material and firmly adhering the same by using a binder, then adding metal powder of a matrix of a diamond-containing support body, and pressing a drill bit steel body to complete the mold assembly of the sintering drill bit;

(9) the technological parameters of the hot-pressing columnar diamond composite drill bit are as follows: the temperature is 945 ℃, the pressure is 16MPa, the temperature and the pressure are kept for 5.0min, and the tapping temperature is 800 ℃;

(10) after the drill bit of the columnar diamond complex is taken out of the furnace, the drill bit is slowly cooled to room temperature under the condition of heat preservation, and then machining and decoration are carried out, namely the drill bit finished product is obtained.

Example 2:

the specification of the drill bit with the diameter of 95/68mm is taken as an example for further explanation.

(1) The drill bit is designed into 10 fan-shaped working bodies, namely the drill bit is provided with 10 corresponding water gaps;

(2) the diameter of the cambered surface trapezoidal columnar diamond complex is 6.5 multiplied by 5.0mm, and the height of the cambered surface trapezoidal columnar diamond complex is 13 mm;

(3) and the tire body material of the cambered surface trapezoidal columnar diamond complex: 15% of YG12, 42% of WC, 9% of Ni, 4% of Mn and 30% of 660-Cu;

(4) and diamond parameters in the cylindrical diamond complex: 70% in 35/40 meshes, 30% in 50/60 meshes and SMD in all₄₀A grade diamond;

(5) and the technological parameters of the enhanced hot-pressing cambered surface trapezoidal columnar diamond complex are as follows: the pressure is 19MPa, the temperature is 995 ℃, the heat preservation and the pressure maintaining are carried out for 8.0min, and the tapping temperature is 750 ℃;

(6) and a support body matrix material: 47% of Fe, 13% of Ni, 5% of Mn and 35% of 660-Cu;

(7) and compounding diamond in the matrix material of the support body: granularity 40/50 mesh, grade SMD₃₀The percentage concentration is 55 percent, and the diamond and the matrix material are uniformly mixed by a ball mill for standby;

(8) assembling a drill bit sintering mold, namely fixing the columnar diamond complex in the mold according to a designed scheme selectively and regularly, adding a gauge protection material and firmly adhering the same by using a binder, then adding metal powder of a matrix of a diamond-containing support body, and pressing a drill bit steel body to complete the mold assembly of the sintering drill bit;

(9) the technological parameters of the hot-pressing cambered surface trapezoidal columnar diamond composite drill bit are as follows: keeping the temperature at 950 ℃ and the pressure at 16MPa for 5.5min, and tapping at 780 ℃;

(10) after the drill bit of the columnar diamond complex is taken out of the furnace, the drill bit is slowly cooled to room temperature under the heat preservation condition, taken out of the furnace, machined and decorated, and the finished product of the drill bit is obtained.

Those not described in detail in this specification are within the skill of the art.